// 暴露一个方法
exports.sayHi = function(){
    document.write("<h1>webpack project</h1>")
};
exports.sayHi1 = function(){
    document.write("<h1>javascript project</h1>")
};
exports.sayHi2 = function(){
    document.write("<h1>typescript project</h1>")
};
exports.sayHi3 = function(){
    document.write("<h1>PHP project</h1>")
};